Knife net retaining mechanism

The utility model discloses a knife net holding mechanism which comprises a knife net fixing frame in an annular wall shape, a knife net supporting frame located in the knife net fixing frame and in an annular disc shape, and a knife net cover inserted in the knife net fixing frame and supported on the knife net supporting frame. Two clamping grooves are formed in the inner surface of the knife net fixing frame, and a clamping tongue clamped into one clamping groove is arranged on the outer edge face of the knife net supporting frame. The knife net supporting frame is provided with an installation groove, and the installation groove forms a first notch and a second notch in the outer edge face and the bottom face of the knife net supporting frame. A locking piece made of a tough material is arranged in the mounting groove, one end of the locking piece extends out of the first notch and is clamped into the other clamping groove, the other end of the locking piece extends out of the second notch, and the lockin